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cae1ea691d
This patch teaches method 'LowerVECTOR_SHUFFLE' to give higher precedence to the check for 'isBlendMask'; the idea is that, when possible, we should firstly check if a shuffle performs a blend, and in case, try to lower it into a BLENDI instead of selecting a SHUFP or (worse) a VPERM2X128. In general: - AVX VBLENDPS/D always have better latency and throughput than VPERM2F128; - BLENDPS/D instructions tend to always have better 'reciprocal throughput' than the equivalent SHUFPS/D; - Both BLENDPS/D and SHUFPS/D are often decoded into the same number of m-ops; however, a m-op obtained from a BLENDPS/D can be scheduled to more than one execution port. This patch: - Moves the check for 'isBlendMask' immediately before the check for 'isSHUFPMask' within method 'LowerVECTOR_SHUFFLE'; - Updates existing tests for sse/avx shuffle/blend instructions to verify that we select (v)blendps/d when possible (instead of (v)shufps/d or vperm2f128). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211720 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.6 KiB
LLVM
70 lines
2.6 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=corei7-avx -mattr=+avx | FileCheck %s
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; CHECK: _A
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; CHECK: vperm2f128 $1
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define <8 x float> @A(<8 x float> %a, <8 x float> %b) nounwind uwtable readnone ssp {
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entry:
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%shuffle = shufflevector <8 x float> %a, <8 x float> %b, <8 x i32> <i32 4, i32 5, i32 6, i32 7, i32 0, i32 1, i32 2, i32 3>
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ret <8 x float> %shuffle
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}
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; CHECK: _B
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; CHECK: vblendps $240
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define <8 x float> @B(<8 x float> %a, <8 x float> %b) nounwind uwtable readnone ssp {
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entry:
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%shuffle = shufflevector <8 x float> %a, <8 x float> %b, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 12, i32 13, i32 14, i32 15>
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ret <8 x float> %shuffle
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}
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; CHECK: _C
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; CHECK: vperm2f128 $0
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define <8 x float> @C(<8 x float> %a, <8 x float> %b) nounwind uwtable readnone ssp {
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entry:
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%shuffle = shufflevector <8 x float> %a, <8 x float> %b, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 0, i32 1, i32 2, i32 3>
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ret <8 x float> %shuffle
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}
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; CHECK: _D
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; CHECK: vperm2f128 $17
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define <8 x float> @D(<8 x float> %a, <8 x float> %b) nounwind uwtable readnone ssp {
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entry:
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%shuffle = shufflevector <8 x float> %a, <8 x float> %b, <8 x i32> <i32 4, i32 5, i32 6, i32 7, i32 4, i32 5, i32 6, i32 7>
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ret <8 x float> %shuffle
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}
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; CHECK: _E
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; CHECK: vperm2f128 $17
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define <32 x i8> @E(<32 x i8> %a, <32 x i8> %b) nounwind uwtable readnone ssp {
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entry:
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%shuffle = shufflevector <32 x i8> %a, <32 x i8> %b, <32 x i32> <i32 16, i32 17, i32 18, i32 19, i32 20, i32 21, i32 22, i32 23, i32 24, i32 25, i32 26, i32 27, i32 28, i32 29, i32 30, i32 31, i32 16, i32 17, i32 18, i32 19, i32 20, i32 21, i32 22, i32 23, i32 24, i32 25, i32 26, i32 27, i32 28, i32 29, i32 30, i32 31>
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ret <32 x i8> %shuffle
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}
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; CHECK: _E2
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; CHECK: vperm2f128 $3
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define <4 x i64> @E2(<4 x i64> %a, <4 x i64> %b) nounwind uwtable readnone ssp {
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entry:
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%shuffle = shufflevector <4 x i64> %a, <4 x i64> %b, <4 x i32> <i32 6, i32 7, i32 0, i32 1>
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ret <4 x i64> %shuffle
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}
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;;;; Cases with undef indicies mixed in the mask
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; CHECK: _F
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; CHECK: vperm2f128 $33
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define <8 x float> @F(<8 x float> %a, <8 x float> %b) nounwind uwtable readnone ssp {
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entry:
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%shuffle = shufflevector <8 x float> %a, <8 x float> %b, <8 x i32> <i32 undef, i32 undef, i32 6, i32 7, i32 undef, i32 9, i32 undef, i32 11>
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ret <8 x float> %shuffle
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}
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;;;; Cases we must not select vperm2f128
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; CHECK: _G
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; CHECK-NOT: vperm2f128
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define <8 x float> @G(<8 x float> %a, <8 x float> %b) nounwind uwtable readnone ssp {
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entry:
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%shuffle = shufflevector <8 x float> %a, <8 x float> %b, <8 x i32> <i32 undef, i32 undef, i32 6, i32 7, i32 undef, i32 12, i32 undef, i32 15>
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ret <8 x float> %shuffle
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}
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